US4308003A - Device for adjusting the inductance of a coil - Google Patents

Device for adjusting the inductance of a coil Download PDF

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Publication number
US4308003A
US4308003A US06/146,552 US14655280A US4308003A US 4308003 A US4308003 A US 4308003A US 14655280 A US14655280 A US 14655280A US 4308003 A US4308003 A US 4308003A
Authority
US
United States
Prior art keywords
input
control
inductance
coil
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/146,552
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English (en)
Inventor
Raymond Salvy
Guy Brugerie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Philips Corp
Original Assignee
US Philips Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Assigned to U. S. PHILIPS CORPORATION, A CORP. OF DE reassignment U. S. PHILIPS CORPORATION, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BRUGERIE GUY, SALVY RAYMOND
Application granted granted Critical
Publication of US4308003A publication Critical patent/US4308003A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias

Definitions

  • the invention relates to a device for adjusting the inductance of a coil comprising a core which consists of a mixture of a soft magnetic material and a binder material.
  • the inductance is customarily adjusted by displacement of the threaded core within the former on which the coil is wound. This method is time consuming and hence expensive, while the adjustment thus obtained does not preclude undesired changing of the inductance at a later stage, in spite of the means used for arresting the core in its ultimate position. Moreover, automation of the adjustment by the turning of the core in the unit formed by the coils on a printed circuit board is difficult due to the complexity of the mechanical means to be used.
  • the device in accordance with the invention is characterized in that it comprises a nozzle for injecting a magnetic paste, said nozzle comprising an electric valve with a control winding which is coupled, via a control circuit, to the output of a comparison circuit which comprises two inputs, a first input thereof being connected to the output of an inductance measuring apparatus which is connected to the connections of the coil to be adjusted, while its second input is connected to a reference voltage source.
  • the device in accordance with the invention automatically interrupts the injection of magnetic paste into the winding mandrel as soon as the desired inductance of the coil is reached.
  • the adjustment of the inductances of a plurality of coils mounted on a printed wiring board can be simultaneously performed, if desired, by using a corresponding number of inductance measuring apparatus and a corresponding number of comparison circuits.
  • a given pressure is sustained via an inlet 2 for compressed air.
  • the lower part of the reservoir 1 comprises three paste injection nozzles 3a, 3b and 3c, provided with electric valves 4a, 4b and 4c. Underneath these nozzles there are arranged three coils 5a, 5b and 5c, the first one of which (5a) is shown in a longitudinal sectional view. These coils are mounted on a printed wiring board 6.
  • Each of the selection contacts of the first selector switch 7 is connected to one of the electric valves 4a, 4b, 4c, each of the selection contacts of the second switch 8 being connected to a connection of one of the coils 5a, 5b, 5c, and each of the selection contacts of the third switch 8 being connected to a terminal of one of the reference voltage sources 10a, 10b and 10c.
  • the other connections of the coils 5a, 5b and 5c and the other terminals of the voltage sources 10a, 10b and 10c are connected to a common ground terminal 11.
  • the master contact of the first switch 7 is connected, via a control circuit 12, to the output of a comparison circuit 13, one input of which is connected to the output of an inductance measuring apparatus 14, the input of which is connected to the master contact of the second switch 8.
  • the other input of the comparison circuit 13 is connected to the master contact of the third switch 9.
  • the output of the comparison circuit 13 is also connected, via a second control circuit 15, to a common control input of the switches 7, 8 and 9.
  • the control circuit 12 comprises a lock control input 16.
  • the inductance measuring apparatus 14 supplies the first input of the comparison circuit 13 with a direct voltage which is proportional to the inductance of the coil connected to the input of the apparatus 14, in this case the coil 5a.
  • the output of the comparator 13 is in a state which keeps the electric valve 4a opened via the control circuit 12.
  • the magnetic paste then flows into the winding mandrel of the coil 5a, the inductance thereof thus being increased.
  • the state of the output of the comparison circuit 13 changes so that the valve 4a is closed and the ejection of paste is interrupted.
  • the inductance can be adjusted by changing the value of the voltage of the source 10a.
  • the change of state of the output of the comparison circuit 13 controls, via the second control circuit 15, the change over of the switches 7, 8 and 9 to their second position in which the described process is repeated, the ultimate inductance of the coil 5b then being determined by the value of the voltage of the voltage source 10b. Subsequently, the inductance of the coil 5c is adjusted by way of the source 10c. After that, the adjusted board is replaced by another board and the switches 7, 8 and 9 return to their first position.
  • the input 16 of the control circuit 12 serves to keep the electric valve connected to the switch 7 closed during the replacement of the boards.
  • These valves are of the normally closed electromagnetic type, which means that the opening of the valves is controlled by the application of a voltage. It is alternatively possible to use normally open electric valves, that is to say valves which are closed by the application of a voltage.
  • a valve of this kind can be realized by surrounding the injection nozzles 3a, 3b and 3c with a coil in which the passage of current interrupts the supply of paste by the formation of a magnetic plug.
  • the quantity of paste present in the nozzle itself increases the apparent inductance of the coil, but this can be readily taken into account by suitable adaptation of the reference voltages of the sources 10a, 10b and 10c because the geometrical positions of the coils with respect to the nozzles are substantially the same for different boards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
US06/146,552 1979-05-23 1980-05-05 Device for adjusting the inductance of a coil Expired - Lifetime US4308003A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7913135 1979-05-23
FR7913135A FR2457551A1 (fr) 1979-05-23 1979-05-23 Dispositif pour regler a une valeur determinee et definitive l'inductance d'une bobine munie d'un noyau magnetique

Publications (1)

Publication Number Publication Date
US4308003A true US4308003A (en) 1981-12-29

Family

ID=9225780

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/146,552 Expired - Lifetime US4308003A (en) 1979-05-23 1980-05-05 Device for adjusting the inductance of a coil

Country Status (9)

Country Link
US (1) US4308003A (de)
JP (1) JPS55157220A (de)
CA (1) CA1155276A (de)
DE (1) DE3019165A1 (de)
ES (1) ES491670A0 (de)
FR (1) FR2457551A1 (de)
GB (1) GB2053578B (de)
IT (1) IT1130721B (de)
NL (1) NL8002922A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613295A (en) * 1981-09-26 1986-09-23 U.S. Philips Corporation Molding apparatus with sensor means
CN115497737A (zh) * 2022-09-01 2022-12-20 深圳市科达嘉电子有限公司 磁性浆状物制备方法、电感器的装配方法及大电流电感器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5202555A (en) * 1983-01-10 1993-04-13 Minolta Camera Kabushiki Kaisha Focus detecting device for use with cameras with correlation and contrast detecting means
US4636624A (en) * 1983-01-10 1987-01-13 Minolta Camera Kabushiki Kaisha Focus detecting device for use with cameras
JPS6032014A (ja) * 1983-08-01 1985-02-19 Minolta Camera Co Ltd カメラの焦点検出装置
JPH067219B2 (ja) * 1983-08-16 1994-01-26 ミノルタカメラ株式会社 カメラの焦点検出装置
JPH0555040A (ja) * 1991-08-23 1993-03-05 Toko Inc 複合部品のインダクタンス調整方法
CN113178314B (zh) * 2021-05-13 2023-05-16 长兴超能科技有限公司 一种自动控制电感量的电感器及其控制方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632244A (en) * 1968-10-30 1972-01-04 British Iron Steel Research Rolling strip from powder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1416509A (fr) * 1964-09-23 1965-11-05 Parisienne De Const Electro Me Circuit magnétique moulé
US3548492A (en) * 1967-09-29 1970-12-22 Texas Instruments Inc Method of adjusting inductive devices
DE2545004B2 (de) * 1975-10-08 1977-10-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Abgleichverfahren fuer elektrische schwingkreise

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632244A (en) * 1968-10-30 1972-01-04 British Iron Steel Research Rolling strip from powder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613295A (en) * 1981-09-26 1986-09-23 U.S. Philips Corporation Molding apparatus with sensor means
CN115497737A (zh) * 2022-09-01 2022-12-20 深圳市科达嘉电子有限公司 磁性浆状物制备方法、电感器的装配方法及大电流电感器

Also Published As

Publication number Publication date
FR2457551B1 (de) 1982-04-16
ES8103874A1 (es) 1981-03-16
GB2053578A (en) 1981-02-04
NL8002922A (nl) 1980-11-25
CA1155276A (en) 1983-10-18
IT8022199A0 (it) 1980-05-20
JPS55157220A (en) 1980-12-06
FR2457551A1 (fr) 1980-12-19
DE3019165A1 (de) 1980-12-04
ES491670A0 (es) 1981-03-16
IT1130721B (it) 1986-06-18
GB2053578B (en) 1983-04-07

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Legal Events

Date Code Title Description
AS Assignment

Owner name: U. S. PHILIPS CORPORATION, 100 E. 42ND ST., NEW YO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SALVY RAYMOND;BRUGERIE GUY;REEL/FRAME:003859/0855

Effective date: 19800617

STCF Information on status: patent grant

Free format text: PATENTED CASE